Coal-mine drill.



J. A. WALKER.

COAL MINEIDRILL.

APPLHJAUON FILED APR. 5. 19-18.

1 ,271,396. Patented Jul 2, 1918.

LIA. milk e 9 amines.

' WALKER, a'citiz'en of the United States, eg siding at Springfield, inthe county of San:

'clear, and exactdescription of theinventionf such'as will enable others skilled in the art to which'it appertainsto make and use the w n by the. operation of the drill, while the ex- ;nnir'nn STATES "rn'rnn'r err-10E.

.iosnrn Amman WALKER, or srmnermtn, rumo connmnn mum.

l Specification of Letters Patent.

Application filed April 5 1918. Seria1No. 226,392.

" To all whom it may concern:

Be it known that I, JOSEPH gamon, State of Illinois, have invented a new and useful Coal-Mine Drill; and I do v a hole. of the desired diameter.

herebydeclare the following to be a full,

same.

' \The present invention relates to a core' drill which is especially ada ted for mining purposes,and has for its 0 ject'to provide a device ofthis character which'embodies novel. features of construction whereby removable cutter bits are employed, thereby saving the loss of time and expense which is incident to filing the ordinary cutters and in carrying the drills back and forth between v the mine and the blacksmith shop.

Further objects of the .invention'are to i provide a device oflthis character which'is comparatively simpleand inexpensive in its construction, which .can be used in connection with the-standard drill operating devices now in use, 'whichenables the cutting (bits to be quicklyreplaced when they become dull, and which will operate quickly and without loss of time, thereby reducing the time consumed injdrilli'ng' and enabling the miner to get out a greater quantity of 'materialg ith these and other objects in view, the invention consists in certain novel combinations and arrangements of the parts as will more fully appearas the description pro ceeds, the novel features thereof being pointed outin the appended claims. 7 I

For a full understanding of the invention, reference is to be had to the following, description and accompanying drawing, in

Figure l isa side'elevation of a core drill constructed in accordance with the invention.

Fig. 2 is a longitudinal sectional. view .through the same. Fig. 8 is a bottom plan view of the same with the bits removed.

Figs. l and 5 are,detailviews of one of the cutting bits.

Fig. 6 is a detail view of one of the spring locking keys. I

Corresponding and like parts are referred to in the following description and indicated anism.

trates, one embodiment of the invention, the

same

awing, which illu's- Patented July 2,1918.

numeral '1 designatesanelongated tubularstock which is of the proper size for drilling rior of the tubular stock is hollow and formed .with smooth sides so as to receive the core of coal or rock which is produced terior of the stock is surrounded by a spiral 2" which serves to move the cuttings from the bits to the outer end of' the hole.

The inte One end of the tubular stock 1 has a socket 3 applied thereto, said socket being shown for the pur pose of illustration as threadedto the, stock at 4, and as fo rmed with a tapering polygonal opening 5 adapted to be en-- gaged by any standard drill operating mechexteriorly threaded at 6 toreceive. an annular cutting head-7, the exterior of the cut ting head being provided with a series of inclined ribs 8 5which project outwardly slightly beyond the edge of the spiral flange- 2, the extreme external diameter'of the cut- The opposite end of the stock 1 is ting head 7 and ribs being thus slightly greater than the extreme external diameter of the tubular stock 1 and spiral flange. One end of the cutting head '7 is rabbeted and threaded to receive the threadedend 6 of the stock 1, theinterior diameter of the cutting head being otherwise the same as that of the tubular stock. 1

The free end of the annular cutting head 7 is formed with .a seriesjof transverseslots 9, said slots extending inwardly at an inclination or angle to the longitudinal axis of the stock, and openin' through both the inner and outer sides 0 One of these slots 9 is provided for each of the ribs 8, the inclination of the slots corresponding to the inclination of the ribs-and being the proper inclination for the removable cutting bits 10. One side of each of the slots 9 isformed with a longitudinally extending depression '11 which 1s substantially V-shaped in cross section. The cutting bits 10 have a cross section corresponding to that ofthe slots9 and depressions 11 and are insertible within the slots from the end of the cutting head. The provision of the slots 9 enablesthe cutting bits to have a width equal to the thickness of the walls of the cutting head, and also enables the bits to be the cutting head.

readily pried But of position by inserting a tool under the bits in the ends of the slots.

The bits are preferably provided with a cutting edge 10 at each end thereof, there-.

by making them reversible, so that when one verse grooves 13 formed in the cutting head at the sides of the-slots '9, and are provided at their middle portions with crimps 12* adapted to spring into depressed seats formed in the cutting bits 10. The locking keys can thus be forcibly inserted in position or removed therefrom by, means of a suitable punch, and when they are in posi-1 tion they look the cutting. bits securely in place and prevent any possibility of the bits becoming accidentally displaced. The depressed seats 14: are placed at the middle of the cutting bits so that the use of the locking key does'not interfere with the reversibility of the bits.

In the use of the drill the bits 10 are inserted in operative position within the inclined slots 9 of the cutting head 7, whereupon the drill is ready for use and can be operated by any conventional or standard drill operating device. 'When using the device in connection with soft 'coalit can be operated by hand. Thecutting bits 10 'op' erate in the usual manner to-produce an annular opening in the coal or rock, leaving a core which enters the tubular stock 1.- The coal has escape from the bits through the spaces between the ribs 8 of the cutting heads 7, and then carried outwardly to the end of the hole by the spiral flange 2 of the stock 1. When the bits become. dull they can be readily reversed or replaced with fresh bits, and the necessity of stopping to file the cutters is thus avoidedr It is also unnecessary to carry the drills back and forth between the mine and the blacksmith shop for the purpose of having the drills sharpened, and with this device a coal miner can do the necessary drilling in a very short period of time, thereby glving him more time to load coal and enabling him to very materially increase his output.

Having thus described the invention, what I claim as new and desire to secure by Letters Patent, is

1. A core drill including an elongated tubular stock, an annular drilling head applied to one end of the stock and provided at its free end with a series of inwardly extending slots which areinclined to the axis of the stock, one side of each of the slots formed with a longitudinal depres- .bular stock provided upon the exterior thereremovably within the slots and projecting sion, and cutting bits fitted removably in the slots and depressed sides thereof, said outtingbits projecting beyond the cutting head and being inclined to the axis of the stock.

2. A core drill including an elongated tubular stock, an annular drilling head applied to one end of the stock and provided upon its exterior with a series of inclined ribs, the end of the cutting head being provided with a series of slots which extend inwardly at an inclination to the axis of the stock "and each have one side provided with a longitudinal depression, one of the slots being provided for each of the ribs and the slots extending transversely of the cutter head and opening through both the inner and outer walls thereof, and cutting bits fitted removably within the said slots and projecting beyond the cutting head.

3. A core drill including an elongated tuof with a spiral flange, an annuiar cutting head fitted upon one end of the tubular stock and provided upon the exterior thereof with inclined ribs which project outwardly so slightly beyond the-spiral'flange of the stock, the end of the cutting head being provided with slots which extendinwardly at an angle to the axis of the stockand each have one side provided with a longitudinal groove, one of the slotsbeing providedv for each of the exterior, ribs of the cutting head and the slots opening through both the outer and inner walls of the cutting head, and bits fitted beyond the cutting head, said bits having a width correspondingto the thickness of the grooved seat, cutting bits fitted removably within the slots and provided with depressed seats adapted to register with the grooved seats of the slots when the bits are in position, and spring locking keys insertible in the grooved seats and formed with crimped I portions adapted to spring into the depressed seats of the cutting bits.

5. A core drill including an elongated tubular stock, an annular drilling head applied to one end of the tubular st k and 1 provided upon the exterior thereof with a series of inclined ribs, the end of the cutting head being provided with a series of slots which extend inwardly at an angle to the axis of the stock and each have a long-itudi nal depression on one side thereof and a transverse groove at the opposite side, one of the slots being provided for each of the ribs and the slots-opening through both the interior and exterior walls of the cutting head, cutting bits fittedfre-.

movably within the slots and projecting he bits are in position, and spring locking keys insertible within the transverse grooves and formed with 'crimped portions adapted to spring into the depressed seats of the bits,

6. A core drill including an elongated tubular stock, an annular drilling head flP-' plied toione end-of the stock and provided upon'the exteriorthereof with a series of inclined ribs, the end of the head being provided'with a series offslots which extend inwardly at an inclination to the. ax'isof the stock and each have one side provided with a. longitudinal depression while the, other .side is provided with a transverse groove,

one of the slots being' provided for-each ofthe exterior ribs of the head and the slots opening through both the interior and exterior; walls of the head, reversible'cutting bits inserted removably in the slots and each provided at its middle portion with a depressed seat adapted to register with thebefore mentionedtransverse groove-when the bit is in position, and spring lockingkeys insertible in the transverse groove. and

formed with crimped portions adapted to spring into the depressed seats of the bits.

" In testimony whereof I have signedmy. nameto this specification in'the presence of two subscribing witnesses.

JOSEPH. ALFRED WALKER. Witnesses: v.

' JAMES S. H. BAIN,

Y i v 'GmRcnK, BAIN. 

